docs: def platform(self):
          """The platform the server is running on.
  
          Returns:
              str: the platform of the remote server, as in `sys.platform`.
          """
          uname_sys = self._exec_command("uname -s")
          sysinfo = self._exec_command("sysinfo")
          if uname_sys is not None:
              if uname_sys == b"FreeBSD":
                  return "freebsd"
              elif uname_sys == b"Darwin":
                  return "darwin"
              elif uname_sys == b"Linux":
                  return "linux"
              elif uname_sys.startswith(b"CYGWIN"):
                  return "cygwin"
          elif sysinfo is not None and sysinfo:
              return "win32"
          return "unknown"